FLEXT development

Activate when project selection declares flext or a manifest depends on flext-core,
and the task changes FLEXT architecture, generation, packaging, or fleet behavior. Do
not activate for generic Python work without FLEXT evidence.

Read the development procedure (skill file). Resolve the active repository's manifest,
branch-matched owners, generated boundaries, dependency graph, public consumers, and
native Make gates before effects. Preserve the canonical facade direction, typed
boundary, single generated projection path, and members-before-umbrella integration
order.

Missing authority, an external source reference, a reverse runtime edge, a hand-edited
projection, or a broken canonical command fails before publication. Fix the owning
source forward, regenerate once, prove a fixed point, exercise the real public runtime,
and run every affected native gate.